Re: [PATCH V6 06/12] SPEAr13xx: Fixup: Move SPEAr1340 SATA platform code to phy driver

From: Kishon Vijay Abraham I
Date: Tue Feb 11 2014 - 06:36:43 EST

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In reply to: Mohit Kumar: "[PATCH V6 06/12] SPEAr13xx: Fixup: Move SPEAr1340 SATA platform code to phy driver"
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Hi,

On Tuesday 11 February 2014 03:00 PM, Mohit Kumar wrote:
> From: Pratyush Anand <pratyush.anand@xxxxxx>
>
> ahci driver needs some platform specific functions which are called at
> init, exit, suspend and resume conditions. Till now these functions were
> present in a platform driver with a fixme notes.
>
> Similar functions modifying same set of registers will also be needed in
> case of PCIe phy init/exit.
>
> So move all these SATA platform code to phy-miphy40lp driver.
>
> Signed-off-by: Pratyush Anand <pratyush.anand@xxxxxx>
> Tested-by: Mohit Kumar <mohit.kumar@xxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: Viresh Kumar <viresh.linux@xxxxxxxxx>
> Cc: Tejun Heo <tj@xxxxxxxxxx>
> Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
> Cc: spear-devel@xxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> ---
> arch/arm/boot/dts/spear1310-evb.dts | 4 +
> arch/arm/boot/dts/spear1310.dtsi | 39 +++++++++-
> arch/arm/boot/dts/spear1340-evb.dts | 4 +
> arch/arm/boot/dts/spear1340.dtsi | 13 +++-
> arch/arm/boot/dts/spear13xx.dtsi | 5 +
> arch/arm/mach-spear/Kconfig | 2 +
> arch/arm/mach-spear/spear1340.c | 127 +------------------------------
> drivers/phy/phy-miphy40lp.c | 144 +++++++++++++++++++++++++++++++++++
> 8 files changed, 208 insertions(+), 130 deletions(-)
>
> diff --git a/arch/arm/boot/dts/spear1310-evb.dts b/arch/arm/boot/dts/spear1310-evb.dts
> index b56a801..d42c84b 100644
> --- a/arch/arm/boot/dts/spear1310-evb.dts
> +++ b/arch/arm/boot/dts/spear1310-evb.dts
> @@ -106,6 +106,10 @@
> status = "okay";
> };
>
> + miphy@eb800000 {
> + status = "okay";
> + };
> +
> cf@b2800000 {
> status = "okay";
> };
> diff --git a/arch/arm/boot/dts/spear1310.dtsi b/arch/arm/boot/dts/spear1310.dtsi
> index 122ae94..64e7dd5 100644
> --- a/arch/arm/boot/dts/spear1310.dtsi
> +++ b/arch/arm/boot/dts/spear1310.dtsi
> @@ -29,24 +29,57 @@
> #gpio-cells = <2>;
> };
>
> - ahci@b1000000 {
> + miphy0: miphy@eb800000 {
> + compatible = "st,miphy", "st,spear1310-miphy";
> + reg = <0xeb800000 0x4000>;
> + misc = <&misc>;
> + phy-id = <0>;
> + #phy-cells = <1>;
> + status = "disabled";
> + };
> +
> + miphy1: miphy@eb804000 {
> + compatible = "st,miphy", "st,spear1310-miphy";
> + reg = <0xeb804000 0x4000>;
> + misc = <&misc>;
> + phy-id = <1>;
> + #phy-cells = <1>;
> + status = "disabled";
> + };
> +
> + miphy2: miphy@eb808000 {
> + compatible = "st,miphy", "st,spear1310-miphy";
> + reg = <0xeb808000 0x4000>;
> + misc = <&misc>;
> + phy-id = <2>;
> + #phy-cells = <1>;
> + status = "disabled";
> + };
> +
> + ahci0: ahci@b1000000 {
> compatible = "snps,spear-ahci";
> reg = <0xb1000000 0x10000>;
> interrupts = <0 68 0x4>;
> + phys = <&miphy0 0>;
> + phy-names = "sata-phy";
> status = "disabled";
> };
>
> - ahci@b1800000 {
> + ahci1: ahci@b1800000 {
> compatible = "snps,spear-ahci";
> reg = <0xb1800000 0x10000>;
> interrupts = <0 69 0x4>;
> + phys = <&miphy1 0>;
> + phy-names = "sata-phy";
> status = "disabled";
> };
>
> - ahci@b4000000 {
> + ahci2: ahci@b4000000 {
> compatible = "snps,spear-ahci";
> reg = <0xb4000000 0x10000>;
> interrupts = <0 70 0x4>;
> + phys = <&miphy2 0>;
> + phy-names = "sata-phy";
> status = "disabled";
> };
>
> diff --git a/arch/arm/boot/dts/spear1340-evb.dts b/arch/arm/boot/dts/spear1340-evb.dts
> index d6c30ae..b23e05e 100644
> --- a/arch/arm/boot/dts/spear1340-evb.dts
> +++ b/arch/arm/boot/dts/spear1340-evb.dts
> @@ -122,6 +122,10 @@
> status = "okay";
> };
>
> + miphy@eb800000 {
> + status = "okay";
> + };
> +
> dma@ea800000 {
> status = "okay";
> };
> diff --git a/arch/arm/boot/dts/spear1340.dtsi b/arch/arm/boot/dts/spear1340.dtsi
> index 54d128d..7e3a04b 100644
> --- a/arch/arm/boot/dts/spear1340.dtsi
> +++ b/arch/arm/boot/dts/spear1340.dtsi
> @@ -31,10 +31,21 @@
> status = "disabled";
> };
>
> - ahci@b1000000 {
> + miphy0: miphy@eb800000 {
> + compatible = "st,miphy", "st,spear1340-miphy";
> + reg = <0xeb800000 0x4000>;
> + misc = <&misc>;
> + phy-id = <0>;
> + #phy-cells = <1>;
> + status = "disabled";
> + };
> +
> + ahci0: ahci@b1000000 {
> compatible = "snps,spear-ahci";
> reg = <0xb1000000 0x10000>;
> interrupts = <0 72 0x4>;
> + phys = <&miphy0 0>;
> + phy-names = "sata-phy";
> status = "disabled";
> };
>
> diff --git a/arch/arm/boot/dts/spear13xx.dtsi b/arch/arm/boot/dts/spear13xx.dtsi
> index 4382547..3a72508 100644
> --- a/arch/arm/boot/dts/spear13xx.dtsi
> +++ b/arch/arm/boot/dts/spear13xx.dtsi
> @@ -220,6 +220,11 @@
> 0xd8000000 0xd8000000 0x01000000
> 0xe0000000 0xe0000000 0x10000000>;
>
> + misc: syscon@e0700000 {
> + compatible = "st,spear1340-misc", "syscon";
> + reg = <0xe0700000 0x1000>;
> + };
> +
> gpio0: gpio@e0600000 {
> compatible = "arm,pl061", "arm,primecell";
> reg = <0xe0600000 0x1000>;
> diff --git a/arch/arm/mach-spear/Kconfig b/arch/arm/mach-spear/Kconfig
> index ac1710e..7e7f1b0 100644
> --- a/arch/arm/mach-spear/Kconfig
> +++ b/arch/arm/mach-spear/Kconfig
> @@ -26,6 +26,8 @@ config ARCH_SPEAR13XX
> select MIGHT_HAVE_CACHE_L2X0
> select PINCTRL
> select USE_OF
> + select MFD_SYSCON
> + select PHY_ST_MIPHY40LP
> help
> Supports for ARM's SPEAR13XX family
>
> diff --git a/arch/arm/mach-spear/spear1340.c b/arch/arm/mach-spear/spear1340.c
> index 3fb6834..8e27093 100644
> --- a/arch/arm/mach-spear/spear1340.c
> +++ b/arch/arm/mach-spear/spear1340.c
> @@ -11,138 +11,13 @@
> * warranty of any kind, whether express or implied.
> */
>
> -#define pr_fmt(fmt) "SPEAr1340: " fmt
> -
> -#include <linux/ahci_platform.h>
> -#include <linux/amba/serial.h>
> -#include <linux/delay.h>
> #include <linux/of_platform.h>
> #include <asm/mach/arch.h>
> #include "generic.h"
> -#include <mach/spear.h>
> -
> -/* FIXME: Move SATA PHY code into a standalone driver */
> -
> -/* Base addresses */
> -#define SPEAR1340_SATA_BASE UL(0xB1000000)
> -
> -/* Power Management Registers */
> -#define SPEAR1340_PCM_CFG (VA_MISC_BASE + 0x100)
> -#define SPEAR1340_PCM_WKUP_CFG (VA_MISC_BASE + 0x104)
> -#define SPEAR1340_SWITCH_CTR (VA_MISC_BASE + 0x108)
> -
> -#define SPEAR1340_PERIP1_SW_RST (VA_MISC_BASE + 0x318)
> -#define SPEAR1340_PERIP2_SW_RST (VA_MISC_BASE + 0x31C)
> -#define SPEAR1340_PERIP3_SW_RST (VA_MISC_BASE + 0x320)
> -
> -/* PCIE - SATA configuration registers */
> -#define SPEAR1340_PCIE_SATA_CFG (VA_MISC_BASE + 0x424)
> - /* PCIE CFG MASks */
> - #define SPEAR1340_PCIE_CFG_DEVICE_PRESENT (1 << 11)
> - #define SPEAR1340_PCIE_CFG_POWERUP_RESET (1 << 10)
> - #define SPEAR1340_PCIE_CFG_CORE_CLK_EN (1 << 9)
> - #define SPEAR1340_PCIE_CFG_AUX_CLK_EN (1 << 8)
> - #define SPEAR1340_SATA_CFG_TX_CLK_EN (1 << 4)
> - #define SPEAR1340_SATA_CFG_RX_CLK_EN (1 << 3)
> - #define SPEAR1340_SATA_CFG_POWERUP_RESET (1 << 2)
> - #define SPEAR1340_SATA_CFG_PM_CLK_EN (1 << 1)
> - #define SPEAR1340_PCIE_SATA_SEL_PCIE (0)
> - #define SPEAR1340_PCIE_SATA_SEL_SATA (1)
> - #define SPEAR1340_SATA_PCIE_CFG_MASK 0xF1F
> - #define SPEAR1340_PCIE_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_PCIE | \
> - SPEAR1340_PCIE_CFG_AUX_CLK_EN | \
> - SPEAR1340_PCIE_CFG_CORE_CLK_EN | \
> - SPEAR1340_PCIE_CFG_POWERUP_RESET | \
> - SPEAR1340_PCIE_CFG_DEVICE_PRESENT)
> - #define SPEAR1340_SATA_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_SATA | \
> - SPEAR1340_SATA_CFG_PM_CLK_EN | \
> - SPEAR1340_SATA_CFG_POWERUP_RESET | \
> - SPEAR1340_SATA_CFG_RX_CLK_EN | \
> - SPEAR1340_SATA_CFG_TX_CLK_EN)
> -
> -#define SPEAR1340_PCIE_MIPHY_CFG (VA_MISC_BASE + 0x428)
> - #define SPEAR1340_MIPHY_OSC_BYPASS_EXT (1 << 31)
> - #define SPEAR1340_MIPHY_CLK_REF_DIV2 (1 << 27)
> - #define SPEAR1340_MIPHY_CLK_REF_DIV4 (2 << 27)
> - #define SPEAR1340_MIPHY_CLK_REF_DIV8 (3 << 27)
> - #define SPEAR1340_MIPHY_PLL_RATIO_TOP(x) (x << 0)
> - #define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA \
> - (SPEAR1340_MIPHY_OSC_BYPASS_EXT | \
> - SPEAR1340_MIPHY_CLK_REF_DIV2 | \
> - SPEAR1340_MIPHY_PLL_RATIO_TOP(60))
> - #define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK \
> - (SPEAR1340_MIPHY_PLL_RATIO_TOP(120))
> - #define SPEAR1340_PCIE_SATA_MIPHY_CFG_PCIE \
> - (SPEAR1340_MIPHY_OSC_BYPASS_EXT | \
> - SPEAR1340_MIPHY_PLL_RATIO_TOP(25))
> -
> -/* SATA device registration */
> -static int sata_miphy_init(struct device *dev, void __iomem *addr)
> -{
> - writel(SPEAR1340_SATA_CFG_VAL, SPEAR1340_PCIE_SATA_CFG);
> - writel(SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK,
> - SPEAR1340_PCIE_MIPHY_CFG);
> - /* Switch on sata power domain */
> - writel((readl(SPEAR1340_PCM_CFG) | (0x800)), SPEAR1340_PCM_CFG);
> - msleep(20);
> - /* Disable PCIE SATA Controller reset */
> - writel((readl(SPEAR1340_PERIP1_SW_RST) & (~0x1000)),
> - SPEAR1340_PERIP1_SW_RST);
> - msleep(20);
> -
> - return 0;
> -}
> -
> -void sata_miphy_exit(struct device *dev)
> -{
> - writel(0, SPEAR1340_PCIE_SATA_CFG);
> - writel(0, SPEAR1340_PCIE_MIPHY_CFG);
> -
> - /* Enable PCIE SATA Controller reset */
> - writel((readl(SPEAR1340_PERIP1_SW_RST) | (0x1000)),
> - SPEAR1340_PERIP1_SW_RST);
> - msleep(20);
> - /* Switch off sata power domain */
> - writel((readl(SPEAR1340_PCM_CFG) & (~0x800)), SPEAR1340_PCM_CFG);
> - msleep(20);
> -}
> -
> -int sata_suspend(struct device *dev)
> -{
> - if (dev->power.power_state.event == PM_EVENT_FREEZE)
> - return 0;
> -
> - sata_miphy_exit(dev);
> -
> - return 0;
> -}
> -
> -int sata_resume(struct device *dev)
> -{
> - if (dev->power.power_state.event == PM_EVENT_THAW)
> - return 0;
> -
> - return sata_miphy_init(dev, NULL);
> -}
> -
> -static struct ahci_platform_data sata_pdata = {
> - .init = sata_miphy_init,
> - .exit = sata_miphy_exit,
> - .suspend = sata_suspend,
> - .resume = sata_resume,
> -};
> -
> -/* Add SPEAr1340 auxdata to pass platform data */
> -static struct of_dev_auxdata spear1340_auxdata_lookup[] __initdata = {
> - OF_DEV_AUXDATA("snps,spear-ahci", SPEAR1340_SATA_BASE, NULL,
> - &sata_pdata),
> - {}
> -};
>
> static void __init spear1340_dt_init(void)
> {
> - of_platform_populate(NULL, of_default_bus_match_table,
> - spear1340_auxdata_lookup, NULL);
> + of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
> }
>
> static const char * const spear1340_dt_board_compat[] = {
> diff --git a/drivers/phy/phy-miphy40lp.c b/drivers/phy/phy-miphy40lp.c
> index 98859ff..16da55b 100644
> --- a/drivers/phy/phy-miphy40lp.c
> +++ b/drivers/phy/phy-miphy40lp.c
> @@ -8,8 +8,10 @@
> * it under the terms of the GNU General Public License version 2 as
> * published by the Free Software Foundation.
> *
> + * 04/02/2014: Adding support of SATA mode for SPEAr1340.
> */
>
> +#include <linux/bitops.h>
> #include <linux/delay.h>
> #include <linux/dma-mapping.h>
> #include <linux/kernel.h>
> @@ -19,6 +21,60 @@
> #include <linux/phy/phy.h>
> #include <linux/regmap.h>
>
> +/* SPEAr1340 Registers */
> +/* Power Management Registers */
> +#define SPEAR1340_PCM_CFG 0x100
> + #define SPEAR1340_PCM_CFG_SATA_POWER_EN BIT(11)

No tabs in the beginning. Just my personal preference though. No strong feelings.
> +#define SPEAR1340_PCM_WKUP_CFG 0x104
> +#define SPEAR1340_SWITCH_CTR 0x108
> +
> +#define SPEAR1340_PERIP1_SW_RST 0x318
> + #define SPEAR1340_PERIP1_SW_RSATA BIT(12)
> +#define SPEAR1340_PERIP2_SW_RST 0x31C
> +#define SPEAR1340_PERIP3_SW_RST 0x320
> +
> +/* PCIE - SATA configuration registers */
> +#define SPEAR1340_PCIE_SATA_CFG 0x424
> + /* PCIE CFG MASks */
> + #define SPEAR1340_PCIE_CFG_DEVICE_PRESENT BIT(11)
> + #define SPEAR1340_PCIE_CFG_POWERUP_RESET BIT(10)
> + #define SPEAR1340_PCIE_CFG_CORE_CLK_EN BIT(9)
> + #define SPEAR1340_PCIE_CFG_AUX_CLK_EN BIT(8)
> + #define SPEAR1340_SATA_CFG_TX_CLK_EN BIT(4)
> + #define SPEAR1340_SATA_CFG_RX_CLK_EN BIT(3)
> + #define SPEAR1340_SATA_CFG_POWERUP_RESET BIT(2)
> + #define SPEAR1340_SATA_CFG_PM_CLK_EN BIT(1)
> + #define SPEAR1340_PCIE_SATA_SEL_PCIE (0)
> + #define SPEAR1340_PCIE_SATA_SEL_SATA (1)
> + #define SPEAR1340_PCIE_SATA_CFG_MASK 0xF1F
> + #define SPEAR1340_PCIE_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_PCIE | \
> + SPEAR1340_PCIE_CFG_AUX_CLK_EN | \
> + SPEAR1340_PCIE_CFG_CORE_CLK_EN | \
> + SPEAR1340_PCIE_CFG_POWERUP_RESET | \
> + SPEAR1340_PCIE_CFG_DEVICE_PRESENT)
> + #define SPEAR1340_SATA_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_SATA | \
> + SPEAR1340_SATA_CFG_PM_CLK_EN | \
> + SPEAR1340_SATA_CFG_POWERUP_RESET | \
> + SPEAR1340_SATA_CFG_RX_CLK_EN | \
> + SPEAR1340_SATA_CFG_TX_CLK_EN)
> +
> +#define SPEAR1340_PCIE_MIPHY_CFG 0x428
> + #define SPEAR1340_MIPHY_OSC_BYPASS_EXT BIT(31)
> + #define SPEAR1340_MIPHY_CLK_REF_DIV2 BIT(27)
> + #define SPEAR1340_MIPHY_CLK_REF_DIV4 (2 << 27)
> + #define SPEAR1340_MIPHY_CLK_REF_DIV8 (3 << 27)

This doesn't look very nice. But I'm not sure if there are similar macros to
handle sequence of bits.
> + #define SPEAR1340_MIPHY_PLL_RATIO_TOP(x) (x << 0)
> + #define SPEAR1340_PCIE_MIPHY_CFG_MASK 0xF80000FF
> + #define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA \
> + (SPEAR1340_MIPHY_OSC_BYPASS_EXT | \
> + SPEAR1340_MIPHY_CLK_REF_DIV2 | \
> + SPEAR1340_MIPHY_PLL_RATIO_TOP(60))
> + #define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK \
> + (SPEAR1340_MIPHY_PLL_RATIO_TOP(120))
> + #define SPEAR1340_PCIE_SATA_MIPHY_CFG_PCIE \
> + (SPEAR1340_MIPHY_OSC_BYPASS_EXT | \
> + SPEAR1340_MIPHY_PLL_RATIO_TOP(25))
> +
> enum phy_mode {
> SATA,
> PCIE,
> @@ -50,6 +106,93 @@ struct miphy40lp_priv {
> const struct miphy40lp_plat_ops *plat_ops;
> };
>
> +static int miphy40lp_spear1340_sata_init(struct miphy40lp_priv *priv)
> +{
> + regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG,
> + SPEAR1340_PCIE_SATA_CFG_MASK, SPEAR1340_SATA_CFG_VAL);
> + regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG,
> + SPEAR1340_PCIE_MIPHY_CFG_MASK,
> + SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK);
> + /* Switch on sata power domain */
> + regmap_update_bits(priv->misc, SPEAR1340_PCM_CFG,
> + SPEAR1340_PCM_CFG_SATA_POWER_EN,
> + SPEAR1340_PCM_CFG_SATA_POWER_EN);
> + msleep(20);
> + /* Disable PCIE SATA Controller reset */
> + regmap_update_bits(priv->misc, SPEAR1340_PERIP1_SW_RST,
> + SPEAR1340_PERIP1_SW_RSATA, 0);
> + msleep(20);
> +
> + return 0;
> +}
> +
> +static int miphy40lp_spear1340_sata_exit(struct miphy40lp_priv *priv)
> +{
> + regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG,
> + SPEAR1340_PCIE_SATA_CFG_MASK, 0);
> + regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG,
> + SPEAR1340_PCIE_MIPHY_CFG_MASK, 0);
> +
> + /* Enable PCIE SATA Controller reset */
> + regmap_update_bits(priv->misc, SPEAR1340_PERIP1_SW_RST,
> + SPEAR1340_PERIP1_SW_RSATA,
> + SPEAR1340_PERIP1_SW_RSATA);
> + msleep(20);
> + /* Switch off sata power domain */
> + regmap_update_bits(priv->misc, SPEAR1340_PCM_CFG,
> + SPEAR1340_PCM_CFG_SATA_POWER_EN, 0);
> + msleep(20);
> +
> + return 0;
> +}
> +
> +static int miphy40lp_spear1340_init(struct miphy40lp_priv *priv)
> +{
> + int ret = 0;
> +
> + if (priv->mode == SATA)
> + ret = miphy40lp_spear1340_sata_init(priv);
> +
> + return ret;
> +}
> +
> +static int miphy40lp_spear1340_exit(struct miphy40lp_priv *priv)
> +{
> + int ret = 0;
> +
> + if (priv->mode == SATA)
> + ret = miphy40lp_spear1340_sata_exit(priv);
> +
> + return ret;
> +}
> +
> +static int miphy40lp_spear1340_suspend(struct miphy40lp_priv *priv)
> +{
> + int ret = 0;
> +
> + if (priv->mode == SATA)
> + ret = miphy40lp_spear1340_sata_exit(priv);
> +
> + return ret;
> +}
> +
> +static int miphy40lp_spear1340_resume(struct miphy40lp_priv *priv)
> +{
> + int ret = 0;
> +
> + if (priv->mode == SATA)
> + ret = miphy40lp_spear1340_sata_init(priv);
> +
> + return ret;
> +}
> +
> +static struct miphy40lp_plat_ops spear1340_phy_ops = {
> + .plat_init = miphy40lp_spear1340_init,
> + .plat_exit = miphy40lp_spear1340_exit,
> + .plat_suspend = miphy40lp_spear1340_suspend,
> + .plat_resume = miphy40lp_spear1340_resume,
> +};
> +
> static int miphy40lp_init(struct phy *phy)
> {
> struct miphy40lp_priv *priv = phy_get_drvdata(phy);
> @@ -100,6 +243,7 @@ static int miphy40lp_power_on(struct phy *phy)
>
> static const struct of_device_id miphy40lp_of_match[] = {
> { .compatible = "st,miphy40lp-phy", .data = NULL },

Do we still need this compatible? Because it doesn't do anything anyways?

Thanks
Kishon
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